Authenticate with client_credentials and VerifyAppCredentials

[codecov-commenter]

Codecov Report

Merging #149 (e147e81) into master (d272534) will increase coverage by 0.15%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   87.01%   87.16%   +0.15%     
==========================================
  Files          15       15              
  Lines         924      935      +11     
==========================================
+ Hits          804      815      +11     
  Misses         75       75              
  Partials       45       45              

Impacted Files	Coverage Δ
apps.go	90.69% <100.00%> (+1.22%)	:arrow_up:
mastodon.go	73.79% <100.00%> (+1.13%)	:arrow_up:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[mattn]

Thank you